Make provideInitialConfigurations' command more robust
Make provideInitialConfigurations' command more robust

If there was no package.json in target folder then no initial
configurations got returned from command. Now it works with package.json
and without it.

ChDxterWard/vscode-janus-debug,otris/vscode-janus-debug,PhilippRo/vscode-janus-debug,bkircher/vscode-janus-debug,ChDxterWard/vscode-janus-debug,otris/vscode-janus-debug,bkircher/vscode-janus-debug,PhilippRo/vscode-janus-debug,tineheller/vscode-janus-debug,tineheller/vscode-janus-debug